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Hi All,
I posted this on the PI forum but thought it might fit here also. It is adapting a wireless headphone system to a metal detector.
I tried a couple of different RF types and found there was to much interference to be used on a PI, so I tried the IR type. Here, I had some decent success. Originally, the best I found was the Koss HB 70 models. They worked extremly well.
Later, I noticed that Radio Shack had their IR headphones on sale at a really good price, so I tried them also. Well, they worked as well as the Koss. In fact, the Koss headphones worked with the RS transmitter, so I suspect we can figure out who made them for RS.
Ok, adapting is quite simple, one simply needs to build a simple power supply for the transmitter. The signal will come from the heaphone jack. Now, for a battery, I used a surplus 7.2V Li Ion battery I purchased from a surplus house. Then I simply attached a coax plug compatible with the power supply so I could use the battery instead of the wall wart supply.
When done, the project worked far better than expected.
Now, for your doit yourselfers, there is a schematic on the net for an IR transmitter and receiver circuit. However, I doubt one could build one for much less than the price of the Radio Shack's setup.
Reg
I posted this on the PI forum but thought it might fit here also. It is adapting a wireless headphone system to a metal detector.
I tried a couple of different RF types and found there was to much interference to be used on a PI, so I tried the IR type. Here, I had some decent success. Originally, the best I found was the Koss HB 70 models. They worked extremly well.
Later, I noticed that Radio Shack had their IR headphones on sale at a really good price, so I tried them also. Well, they worked as well as the Koss. In fact, the Koss headphones worked with the RS transmitter, so I suspect we can figure out who made them for RS.
Ok, adapting is quite simple, one simply needs to build a simple power supply for the transmitter. The signal will come from the heaphone jack. Now, for a battery, I used a surplus 7.2V Li Ion battery I purchased from a surplus house. Then I simply attached a coax plug compatible with the power supply so I could use the battery instead of the wall wart supply.
When done, the project worked far better than expected.
Now, for your doit yourselfers, there is a schematic on the net for an IR transmitter and receiver circuit. However, I doubt one could build one for much less than the price of the Radio Shack's setup.
Reg
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